Shotgun/Rifle wall mount

So does anyone know ANYTHING about this picture. I really really want a wall mount system for my home defense shotgun or any rifle. I can't find anything online about it. I first saw this picture on this forum but it was more for guitars and not quick access to the shotgun or rifle. anyone have any links to where i could buy something that would attach to a rail or around the barrel? thanks guys

Ya i guess no one makes what I'm talking about. I was thinking there should be a post that sticks out from the rail of a gun and pushes into a mount that is attached to the wall. It's hard to explain what I mean. i want to easily pull the firearm right off the wall but I'm going to order one of these to try it out and see what it'll do with various guns. thanks for the help once again.